[Chore] Refresh stale header comment in CLI branding.ts

[cloud-nitrostack]

Refresh stale header comment in CLI branding module

Summary: Top-of-file comment does not match NitroStack branding.

Where to change: typescript/packages/cli/src/ui/branding.ts — header comment block only.

Acceptance criteria:

• Comment reflects NitroStack (or neutral "NitroStack CLI") with no outdated org name.

Suggested labels: chore, good first issue

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Source: docs/STARTER_ISSUES_REVIEW.md — edit in-repo first, then sync GitHub issues if needed.